Chapter 20: Quality of Service (QoS)
Configuring CoS
As explained in “QoS Overview” on page 96, a packet received on a port is placed it into one of four priority queues on the egress port according to the switch’s mapping of 802.1p priority levels to egress priority queues.
The default mappings are shown in Table 2 on page 97.
You can override the mappings at the port level by assigning a new default egress queue to a port. Note that this assignment is made on the ingress port and before the frame is forwarded to the egress port. Consequently, you need to configure this feature on the ingress port. For example, you can configure a switch port so that all ingress frames are stored in egress queue 3 of the egress port, regardless of the priority levels that might be in the frames themselves, as found in tagged frames.
Note
The switch does not alter the original priority level in tagged frames. Frames leave the switch with the same priority level they had when they entered the switch.
To configure CoS for a port, perform the following procedure:
1.From the Advanced Config menu, select QoS Config and then select Port Priority.
The Port Priority Configuration page is shown in Figure 62.
Figure 62. Port Priority Configuration Page
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